#47426, Fix hardcoded / URL and clean up output for Page items in statistics reports, patch by Markus Petrux

#60910 by doq: clean up the statistics.module's link handling.  Show clean URLs when available, backport from HEAD

- Statistics node view counter counted a lot of false positives (including a nid 0 for legacy URLs).

  TODO:
  + The contact.module was broken; a new patch for contact.module is needed.
  + Documentation is needed.
  + The most important modules need to be updated ASAP.

  Usernames can now be themed; eg. an icon/avatar could be added.

  TODO: update contributed modules + update the migration docs.

- (#15121) Improve string cut-off for locale table

- Patch #24135 by Moshe: made it possible to ban visitors based on hostname/IP.  Banning visitors can either be done from the 'access control' pages, or directly from the statistics pages.  This feature is very convenient to block badly behaving crawlers.

- Code cleanup: improve format_plural usage, add some missing placeholder/check calls, and introduce API for <link> tags.

  This make it trivial to spot evil crawlers.

- Added the ability to track page generation times in the statistics module.
  (Made some improvements as per the suggestions in the issue.)

- Added extended timer implementation.